pgsql: Fix another problem in 8.2 changes that allowed "one-time" qual

Log Message:
-----------
Fix another problem in 8.2 changes that allowed "one-time" qual conditions to
be checked at plan levels below the top; namely, we have to allow for Result
nodes inserted just above a nestloop inner indexscan.  Should think about
using the general Param mechanism to pass down outer-relation variables, but
for the moment we need a back-patchable solution.  Per report from Phil Frost.

Modified Files:
--------------
    pgsql/src/backend/executor:
        nodeResult.c (r1.38 -> r1.39)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeResult.c.diff?r1=1.38&r2=1.39)
    pgsql/src/backend/optimizer/plan:
        setrefs.c (r1.128 -> r1.129)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c.diff?r1=1.128&r2=1.129)